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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Synthetic Biology

Background:

  • Nucleic acid probes are crucial for DNA/RNA detection and computation, often using fluorescence activated by fluorophore-quencher separation.
  • Existing reporter systems require two separate oligonucleotides, complicating upstream circuit design.

Purpose of the Study:

  • To develop a novel, single-molecule nucleic acid reporter probe for enhanced DNA computing.
  • To enable proximity-induced chemical reactions for signal output in nucleic acid systems.

Main Methods:

  • Designed a hairpin-forming nucleic acid reporter probe with a blocking strand.
  • Utilized template-induced proximal reactivity for small molecule activation via an inverse electron demand Diels-Alder reaction.
  • Demonstrated activation of a vinyl ether-caged fluorophore by tetrazine.

Main Results:

  • The novel hairpin reporter probe activates a small molecule in the presence of an unmodified nucleic acid input.
  • Displacement of the blocking strand triggers hairpin formation and proximity-driven reaction.
  • Robust small-molecule activation was observed in vitro and within cells.

Conclusions:

  • This new DNA hairpin reporter probe simplifies nucleic acid circuit design.
  • It enables robust small-molecule activation and logic operations in the presence of DNA inputs.
  • The approach expands the utility of DNA computing by providing chemical reaction outputs.